... 3,Material: silicone 4,OEM & ODM warmly welcomed Silicone Sealing Ring:1,Performance: FDA grade, oil resistance, friction resistance, anti-aging ... resistance etc 2,Toolings: more than 2 thousand toolings of o-rings, washers and gaskets 3,Color: free choice(black, white ... ; SBR; NR; HNBR; PA; PU; CR; F.Silicone etc 8,Size: all sizes are available upon request(OEM & ODM products warmly ...